MIL-PRF-23798D(SH)
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed on each size fan-coil assembly when a
first article sample is required (see 3.1). This inspection shall include the examination of 4.4 and the tests of Table
4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the tests of
Table VIII.
4.4 Examination. Each fan-coil assembly shall be examined for compliance with the requirements specified in
3.2 through 3.13. Any redesign or modification of the contractor's standard product to comply with the specified
requirements, or any necessary redesign or modification following failure to meet the specified requirements shall
receive particular attention for adequacy and suitability. This element of inspection shall encompass all visual
examinations and dimensional measurements. Non-compliance with any specified requirements or presence of one
or more defects preventing or lessening maximum efficiency shall constitute cause for rejection.
4.6.1 Shock test. The fan-coil assembly shall be shock tested on the medium-weight machine as specified for
grade A shock of MIL-S-901 (see 6.2). The fan-coil assembly shall be operated at rated voltage and current, rated
airflow, and a hydrostatic pressure of at least 100 pounds per square inch (lb/in2) gauge shall be maintained on the
cooling coil of the unit during the shock tests. Evidence of fragmentation or missile effect of parts, deformation that
will cause active interference between parts, failure to operate, or leakage of the cooling coil shall be cause for
rejection.
4.6.2 Vibration tests. The fan-coil assembly shall be subjected to type I vibration tests in accordance with
MIL-STD-167-1 (see 6.2). The exploratory vibration test specified in MIL-STD-167-1 shall include frequencies up
to and including 33 Hz at the table amplitude specified therein. The rotating components of the fan-coil units shall
meet the balance requirements of MIL-STD-167-1 for type II vibration. Any unit which fails to meet any
requirements shall be rejected.
TABLE VIII. Test agenda.
Applicability of test to fan-coil assembly
Tests
Requirement
Test
First Article
Conformance
Shock
HI Shock
-----
√
Vibration
-----
√
Performance
-----
√
Airborne Noise
4.6.4
-----
Nonmagnetic
Only non-
-----
magnetic units
√
√
Motor
√
√
Leakage
√
Maintainability
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